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장대정,함계운 청운대학교 건설환경연구소 2011 청운대학교 건설환경연구소 논문집 Vol.6 No.2
Unsteady mild slope irregular wave motion equation which was induced in case of using equivalent energy wave or multi-direction irregular wave installed offshore breakwater and around groin was checked for the applicability of numerical model. Wave-induced current, longshore current, and beach deformation was compared and examined by calculating the application of numerical model. In addition, in order to examine field applicability, the before and after invasion of Typhoon0215(2002, Rusa) and Typhoon0314(2003, Maemi) by using between the measurement of the observation data in the SangJu beach and the result of numerical model established in this study were compared and scrutinized. 본 연구에서는 비정상 완경사 불규칙 파동방정식을 사용하여 등에너지파 및 다방향 불규칙 파랑이 이안제와 돌제가 설치된 해안에 입사하는 경우 파랑장, 해빈류 그리고 해빈변형을 산정하여 수치모형의 적용성을 비교․검토하였다. 그리고 현장에의 적용성을 검정하기 위하여 T0215(Rusa)와 T0314(Maemi)의 내습 전․후에 상주해빈에서 실측된 자료와 본 연구에서 수립된 수치모형의 결과와 비교․검토하였다. 그리고 수치모형의 현장 적용성을 검정하기 위하여 상주해빈에서 Typhoon0215 (2002년, Rusa)와 Typhoon0314(2003년, Maemi)기간에 실측된 자료를 이용하여 추출된 해빈변형의 결과와 비교․검토하였다.
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장대정 청운대학교 건설환경연구소 2012 청운대학교 건설환경연구소 논문집 Vol.7 No.1
The purpose of this paper is to investigate wave pressure in front of breakwaters by the experimental model test. The vertical and curved breakwaters were set up in the 2-D irregular wave tank to investigate the influence of water depth and submerged breakwaters into wave pressure in front of breakwaters. The study concluded the wave pressure characteristics by water depth that wave pressure of the curved breakwaters were found to be less than those experienced in the vertical breakwaters, because of wave dissipation on the curved breakwaters shape and wave reflection. Wave pressure characteristics by existence or without existence of submerged breakwaters made a conclusion that wave pressure of existence of submerged breakwaters were found to be less than those experienced in without existence of submerged breakwaters, because of wave reflection by submerged breakwaters. 본 연구의 목적은 2차원 불규칙 조파수조에 연직 및 곡면 방파제를 설치하고 잠제의 유․무 및 수심의 변화에 따른 방파제 전면에서의 파압을 추정하기 위하여 수리 모형실험을 수행하였다. 수심의 영향을 고려한 파압의 수리 모형실험 결과 곡면 방파제의 형상으로 인한 파고감쇠와 파의 반사로 인하여 연직 방파제보다 파압의 감소효과가 우수한 것으로 판단된다. 잠제의 유․무에 따른 파압 특성은 잠제에 의한 파의 반사로 인하여 잠제가 설치된 경우 파압의 감소효과는 우수한 것으로 나타났다.
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장대정 청운대학교 건설환경연구소 2013 청운대학교 건설환경연구소 논문집 Vol.8 No.2
Rating curve is a graph of discharge versus stage for a given point on a stream. For the reliable hydrological data acquisition, the improvements of flow measurement technique are desirable with the quantitative analysis of uncertainty with profound discussion. Uncertainty was computed using random uncertainty, systematic uncertainty and total uncertainty in condition that low flow during dry season. Likewise, it was given careful consideration to the uncertainty of relation rating curve equation and standard error from measurement flow when the rating curve equation was developed by the major site stage-discharge data during flood season. 수위-유량곡선은 하천의 임의 점에서 수위와 유량의 그래프이다. 신뢰성 있는 수문학적 자료의 취득을 위한 유량관측 기법의 개선은 불확실도의 정성적인 해석을 요구하고 있다. 평·갈수 조건에서 불확실도는 무작위 불확실도, 계통 불확실도 그리고 총 불확실도를 사용하여 평가하고 있다. 또한 홍수기 동안 주요 관측소에서 관측된 수위-유량자료에 의해 생성된 수위-유량곡선식의 표준편차와 수위-유량곡선식의 관계에 의하여 불확실도를 평가하고자 한다.
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급속응고한 Ag-Sn-In 합금의 미세조직에 미치는 Misch Metal의 영향
장대정,남태운,Chang, Dae-Jung,Nam, Tae-Woon 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.6
Because of a good wear resistance and a stable contact resistance, Ag-CdO is widely used as electrical contact material. But, the Cd-oxide mainly exists as a coarse particle and adversely affected to environment. As a reason, $Ag-SnO_2$ alloy has been developed. The Sn-oxide maintains stable and fine particle even at high temperature. In order to investigate the effect of Misch metal (Mm) additional that affects the formation of the oxide and the formation of fine matrix Ag, we studied the microstructures and properties of Ag-Sn-In(-Mm) material fabricated by rapid solidification process. The experimental procedure were melting using high frequency induction, melt spinning, and internal oxidation. The Mm addition makes Ag matrix more fine than no Mm addition. The reason is that the addition of Misch metal decreased a latent heat of fusion of alloy, as a result the rapid solidification effect of alloy is increased. The maximum hardness shows at 0.3 wt%Mm. after that the hardness is decreased until 0.4 wt% Mm, but still larger than no Mm addition alloy. At 0.5 wt% Mm alloy, the precipitation of Misch metal causes a decrease of hardness than no Mm addition alloy.
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장대정 청운대학교 건설환경연구소 2013 청운대학교 건설환경연구소 논문집 Vol.8 No.1
Critical duration is a concept originating from the attempt to design rainfall, considering the fact that runoff caused by a design flood varies depending on the time distribution of rainfall. This study tried to estimate peak flood reflecting the characteristics of the basin by estimating the critical duration utilizing the general geographical data on the Shinan basin. The Shinan basin was divided into 38 small basins according to the local 2nd-degree river standards, and the maximum peak flood duration period based on the time distribution of the design flood was defined in order to estimate geographical characteristic data and critical duration for each small basin. Correlation analysis was conducted on the critical duration and geographical hydrologic factors affecting the critical duration, and a multiple regression analysis was conducted by setting factors with high correlation as independent variables and the estimated critical duration as a dependent variable, yielding a formula for calculating the critical duration that reflects the geographical characteristics of the basin. 임계 지속시간이란 설계강우에 의해 발생하는 유출량이 강우의 시간적 분포에 따라 변화되는 점을 고려하여 설계하고자 하는 시도에서 시작된 개념이다. 본 연구에서는 신안 유역을 대상으로 지방 2급 하천의 기준에 의하여 38개 소유역으로 분할하고 설계강우의 시간분포에 따른 최대 첨두 홍수량 발생 시간을 임계 지속시간으로 정의하여 각 소유역별 지형특성 자료와 임계 지속시간을 산정하였다. 임계 지속시간과 이에 영향을 미치는 지형학적 수문요소들에 대하여 상관분석을 실시하고 상관성이 우수한 지형인자를 독립변수, 산정된 임계 지속시간을 종속변수로 가정하여 다중회귀분석을 실시하여 대상 유역의 지형학적 특성이 반영된 임계 지속시간에 대한 일반식을 산정하였다.
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급속응고한 Ag-Sn-In계 접점재료의 미세조직에 미치는 Te 의 영향
장대정,권기봉,김영주,조대형,남태운,Chang, Dae-Jung,Kwon, Gi-Bong,Kim, Young-Ju,Cho, Dae-Hyoung,Nam, Tae-Woon 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.1
Contact material is widely used as electrical parts. Ag-CdO has a good wear resistance and stable contact resistance. But the disadvantages of Ag-Cd alloy are coarse Cd oxides and harmful metal, Cd. Then Ag-Sn alloy that has stable and fine Sn oxide at high temperature has been developed. In order to investigate the effect of Te additional that affects the formation of the oxide layer on the surface and the formation of oxide in matrix Ag, we studied the microstructures and properties of Ag-Sn-In(-Te) material fabricated by rapid solidification process. The experimental procedure were melting using high frequency induction, melt spinning, and internal oxidation. Specimens were examined and analyzed by Transmission electron microscopy(TEM), energy dispersive X-ray spectroscopy(EDS) and Vickers hardness. As a result, internal oxidation was completed even at $600^{\circ}C$. Te forms coarse $In_{2}TeO_{6}$ phase and makes fine and well dispersed $SnO_{2}$ Phase. 0.3 wt% Te shows favorable properties.
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碎波帶 외부에서 Return Flow에 관한 實驗的 硏究(Ⅰ)
咸契運,張大正 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-
The vertical distribution of eddy viscosity is discussed to the customary types which are the constant, the linear function and the exponential function. Each coefficient of the eddy viscosities which sensitively affect the precision of solutions is uniquely decided from the additional boundary condition which the velocity becomes zero at the wave trough level. Also the boundary conditions at the bottom and the continuity relation are used in the integration of the governing equation. The theoretical solutions of present model are compared with the various experimental results. The solutions show a good agreement with the experimental results in the case of constant or exponential function type eddy viscosity.
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